磁石係由咩金屬組成?
回答 (2)
2007-01-16 5:07 am
✔ 最佳答案
I presume that you are referring to permanent magnets.Only ferromagnetic substances can be made into permanent magnets. There are only three ferromagnetic elements. They are iron, nickel and cobalt.
2007-01-16 2:56 am
任何金屬只要跟天然磁石碰在一起,也能變磁石
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